Abstract: A color display system including color cathode ray tube has an evacuated envelope including a panel which carries a phosphor screen, a glass neck which houses an electron gun mount assembly, a funnel connecting the faceplate panel and the glass neck, and a stem having a plurality of leads therethrough sealed to and closing the neck at an end thereof; and an electron gun mount assembly. The electron gun mount assembly is supported on the stem via the plurality of leads and has a cathode for generating an electron beam and directing it toward the phosphor screen, a beam control grid electrode, an accelerating electrode, a plurality of focusing electrodes, one of which focusing electrodes is adapted to be supplied with a voltage varying in accordance with an amount of deflection of the electron beam, an anode electrode, and a heater for heating the cathode.

Abstract: A color cathode-ray tube has an in-line type electron gun. Third, fourth, and fifth electrodes form a sub-main lens, and a sixth electrode forms a main lens with the fifth electrode for focusing the three electron beams onto the phosphor screen. The second and fourth electrodes are electrically connected together and the third and fifth electrodes are electrically connected together. A ratio A of an axial length of the fourth G4 electrode to a diameter of the opening of the fourth electrode and a ratio B of an axial length of the fifth G5 electrode to the diameter of the opening of fourth electrode satisfy the following equations: 54A-5B+4.ltoreq.0, 55A-5B+7.gtoreq.0, A-0.18.gtoreq.0, and 95A+10B-73.gtoreq.0.

Abstract: A color cathode ray tube equipped with an in-line electron gun includes a main lens made up of two cylindrical electrodes arranged in a spaced relationship. Each of the electrodes has an opening and having therein a plate electrode with a beam passing area. The electrodes are given different voltages, wherein the D and S values are in the region where all of the following inequalities are satisfied;5.0>S,D>S, and55S-20D.gtoreq.145.5S being a beam spacing between central axes of adjacent electron beams, and D being a diameter in a direction perpendicular to an in-line arrangement of the electron beams, of the cross section of an opening at opposing ends of the electrodes.

Abstract: An in-line type electron gun assembly has a cathode unit for producing a central electron beam and two side electron beams and first and second electrode units. Each of the first and second electrode units has a cylindrical member of a non-circular elongated cross section and a plate member provided on the inner wall of the cylindrical member so as to be joined therewith to define three electron beam passage holes juxtaposed, within the cylindrical member, in a direction parallel with a lengthwise direction of the elongated cross section of the cylindrical member. The plate member of each electrode unit has at least one hole therein serving as an electron beam passage hole for the central electron beam.